Expansion-bolt.



L. R. ZIFFERER.

NNNNNNNNNNN T.

APPLICATION H; 111111111111 s.

NM. v

LOTHAR R. ZIFFERER, OF NEW YORK, -N'. Y.

EXPAN SION BOLT.

Specification of Letters Patent.

Patented Dec. 22, 1914.

Application sied December 12, i913. serial No. 806,270.

To all fao/wm it may concern Be it known that I, LOTHAR R. ZIFFERER, a. citizen of the United States, residing at New York, in the county and State of New York, have invented certain new and useful Improvements in Expansion-Bolts, of which the following is a specification.

This invention relates to expansion bolts, such as ,arev commonly anchored within bodies of solid material, like concrete or masonry, being particularly concerned with the construction of an expansion bolt shield and with a cap-piece designed for attachment thereto.

' In this invention, I have aimed to provide between an expansion shield and cap-piece an interlocking connection which permits of sufficient play yor swinging movement to enable the cap-piece to adjust itself squarely against the face of the material `within which the expansion bolt is anchored, regardless of whether or noty the hole for the shield be drilled exactly perpendicular t'o the surface of the wall. It is also sought to provide a connection between the cappiece and expansion shield which is independent of the bolt or lag-screw which may be used to produce thevexpanding action.

As a further object, I have provided that this interlocking connectionshould be nonrotatable, whereby the expansion shield may be rotated or screwed into position, and its movement' be predetermined through the agency of the cap-piece.

The invention further consists inr numerous other features of construction and combination of parts which are hereinafter described and claimed.

It is wellI known that in many instances the holes drilled to receive expansion bolts should be concealed, both to present a better appearance, and 'to prevent the escape of pulverized material whichl may remain or accumulate within such holes, and which, through vibrations or other causes, frequently tends to fall therefrom. To thisv end, I have provided a cap-piece preferably of ornamental conguration and suitable finish, which is an independent entity in itself. Cap pieces designed for such pur- I poses are'commonly defective in that they become dislocated sooner or later, so that they no longer perform their intended function.` In my invention, however, the'interlocking connection between the cap-piece and the shield is'made permanent and se.

cure, so thatmovement or displacement of the cap-piece from its original position cannot take place. Inl the present invention, moreover, the cap-piece and expansion shield are so constructed that this interlocking connection becomes permanent through the insertion of a bolt or lag-screw which is used to expand the shield. Furthermore, the depth to which the expansion shield may sink within the hole for its reception is in the present invention automatically vpredetermined through the agency of the cappiece, which acts as a stop to limit the position of the expansion bolt. It has not been uncommon to provide the exterior of eX- pansion shields with spiral threads to facilitate insertion of the device within a snug hole and particularly where the surrounding. material is comparatively soft, but without the provision of some'means at the outer end of the expansion shield, by which this threading action is continued to completion, the function of ythe spiral threads cannot be effectively performed. The interlocking and non-rotatable connection between the cap-piece and the shield, which I have provided, enables the cappiece to 'be used as a means by which the expansion shield may be rotated and advanced into such a hole.v

In the drawingr-Fig'ure 1 is a cross section' taken hthrough a body of solid material,

such asy concrete, showing in elevation the` present expansion bolt anchored therein, and

. the cap-piece secured thereto on theA face of the wall, theinterlocking connection therebetween being shown in cross section; Fig. 2 is an elevation of the cap-piece looking directly toward the face of the wall; Fig. 3 is a view similar to Fig. 2, showing the cappiecemodiied slightly to provide a wrench holdg'Fig. 4 is a view of the rear or bearingj side of the cap-piece; Fig. 5 is a cross fsection through Fig. 1 taken on 1ine5-5, looking in the direction of the arrows; and Fig..

6 is a View similar to Fig. 5, showing a slightly modied form of expansion4 shield and cap-piece.

In the drawing, F ig. 1, there is shown a section of a body of material 7 within which is anchored an expansion bolt, the `shield 8 of which is vrepresented as formed with spiral threads 9 upon its exterior arranged to engage with the sides of the hole drilled to receivethe device. Near its outer end. the expansion bolt is provided with a neck 10 of reduced size relatively of the body of the shield, and at its extreme outen end a. flange 11 is formed, constituting, in

' the expansion bolt is secured is a cap-piece 14, here represented as circular in formation, having a central opening 15 through which the bolt 13, (or lag-screw if used) mayv pass;`y As best shown in Fig. 2, the inner or bearing side` of the cap-piece is l formed to provide Yan undercut recess 16 extending laterally and radially Within the body thereof, and having at one end an enlarged entering portion 17 the undercut recess is formed with a cross` section substantially T-shaped, as best shown in Fig. 1. The cap-piece maybe caused to engage with the expansion bolt Vshield by bringing the enlargedfportion 17 of the recess 16 over the flanged head 11, and thereafter moving the cap-piece laterally until, in final position, the expansion shield is centered within the cap-piece, enabling the bolt 13, (or lagscrew is used) to be introduced into the shield through the opening 15 which is arranged tol aline .with the axis of the eXpansion bolt. An inspection of the .figures in the drawing Will show that the length of the recess 16 isvsuch that the aXes of the expansion shield andcap-piece Will aline when the attaching movement above de-.A scribed has been substantially completed.

i The interlocking connection thus established is made permanent by inserting the bolt.V (or lag-screw if used) through the opening 15 into the expansion bolt. shield. The inner wall of this recess against which the head of the shield abuts is rounded at the entering portion not only to remove any obstruc* tion tothe lateral movement ofthe shieldV in Ieither direction, but to assist in guiding the head of the shield to a position of disengagementwhen it is desired -to remove one part from thek other, f

In actual practice, the cap-piece would probably be made 4of cast metal with the recess 16 of sufficient size to permit the head 11 of the expansion shield to engage somewhat loosely therein, so that a limited amount of play or swinging movement could take place to enable the cap-piece to adjust itself squarely against the face of the Wall where it is 'to be used. XThis in no Way prevents a tight impingement of the cap-piece against tlie wall when a bolt or lag-screw is screwed home, and a fixture attached in place. Furthermore, as will be hereinafter explained, the cap-piece locksv non-rotatably with the expansion shield, so that the cap piece may be revolved, and produce a corresponding rotation of the expansion shield prior to expansion within the hole, which, if of proper size and constituency, will allow the threads on the expansion shield to take hold, `thus causing an inward movement thereof, and causing the cap-piece to be tightly impinged against the Wall. In Fig. 3, the cap-piece is shown slightly modified to provide a wrench hold, enabling an appropriate tool to be used to effect this rotation under circumstances where a hand hold would not suiice.

The neck portion of thevdexpansion bolt is shown in cross-section in Fig. 5, as lying substantially in the .plane of the narrower portion of the recess 16. v'lhe expansion bolt in this figure consists of two shells held together by tongues or lugs 18 formed on one shell which overlie o r embrace, the other shell, these tongues being located in the only to thelarger diameter of the neck of the shield. Any tendency of the cap-piece to revolve upon the expansion bolt shield causes the said lugs or tongues to engage with the sides of the recess 16, and thereby prevent anything more than a very limited rotary movement in either direction. For this reason, it is possible to rotate the cappiece and'produce a. corresponding rotation on the part of the expansion shield. It is not at all essential to the present invention, however,'that the expansion bolt shield consists of two or =more shells, since obviously a" one-piece sh-ield, having a member on its outer end answering to the head vll/jto en'- gage within the recess of the'cap-piece, Will -operate to produce an interlocking connection in precisely the; same way. Where the ilo part engaging within any of the. portions of v the recess I16 is so configured as to present any obstruction against the turning of the expansion bolt shield with-in said recess. as, For insta-nce, by=elongating the neck as in Fig. 5, or by providing ay lug or other protrudin'g member, the same non-rotating ef'- fect Will result. In Fig. 6, a modification is as, for instance, when one or more projecshown of the construction above suggested. In this case, a plurality of projecting members are arranged in the plane of the neck of the expansion shield to engage with appropriate portions of the recess 16 to prevent rotation therein.

The head of an expansion bolt shield in many instances is commonly formed with an annular flange which, for the purposes of this invention, isadmirably suited to en- 'gage with the cap piece., This construction, however, may be modified without departing from the spirit of the present invention,

tions are utilized which constitute members capable of lying within the undercut recess 16. It is manifest that little regard for the appearance of the outer end of the expansion shield need be had, since the expansion bolt is. eifectually concealed from view when the cap-piece is placed with its bearing side against the body of the material within which the device is anchored. Since the cap-piece is used chiefly for the purpose of preventing material from falling out of the hole, and for presenting a nished andl attractive appearance, it follows that the cappiece'will ordinarily lbe polished or machined, thus rendering it quite different in finish from the expansion bolt shield. For this reason, its construction, as a distinct entity from the expansion bolt, is highly desirable.

It is apparent, ofcourse, that the cappiece may be withdrawn from the expansion bolt shield by a reversal of the movements which have been described. When the bolt or lag-screw used to produce expansion is entered into the shield and screwed home,; the attachment of the cap piece to the shield becomes permanent, and no chance of vits slipping or dropping away from the shield, or rotating thereon can ever occur, but, if even the. expansion bolt is no longer to be used,the cap-piece may be removed without detriment, by withdrawing the bolt (or lagscrew if used) and thereafter disengaging the cappiece from the head of the shield.

. As long as the cap-piece remains connectled operatively with an expansion shield consisting of two or more shell segments, the

expanding action will be confined entirely to the inner end of the shield where there is the least likelihood of crumbling or cracking of the material against which the `expansion is exerted, due to the unyielding engagement of the sides .of the recess. 16 with the neck of the shield. The lugs or tongues used to effect a connection between the shell'segments serve to maintain the device in an assembled condition, but unless a positive means, such as the cap-piecey described, is used-at the time of expansion to prevent releasing or unlocking of such a temporary binder, ,the shield is aptto be exformed with a flange on the outer end thereof, each said shell having aneck portion of reduced size adjacentsaid flange, and one of said shells having a tongue arranged to engage with the other in said neck portion, of a cap-piece arranged to engage with said shield, and to. lock permanently there- `with 4when said shield is expanded, said\ tongue being arranged to engage with said cap-piece to prevent rotary movement thereof with respect to said shield, substantially as described.

2. The combination with an expansible shield, having an out-turned flange .on its outer end, and having its expansion produced through the actuation of a member entering the shield from the outer end thereof, of a cap-piece formed with an axial bore extending through the body thereof, and

with a recess enlarged at one end and T- shaped in cross section extending laterally I within thebody of said cap-.piece'and terminatingA substantially in line with said bore, and adapted to receive the flanged end of said shield therein when entered through the said enlarged end of the recess, and to be permanently locked therein when an actuating member is introduced into said shield for expanding the same, substantially as described.v

3. The combination with an expansible, shield, having. an out-turned flange on its outer end, and a neck adjacent thereto hav ing unequal diameters, of a cap-piece prorecess, said flanged end of the shield lying within the head of the recess and the neck portion within the body of the recess, with its shorter diameter pointed transversely thereof, whereby the longer diameter of said neck serves to prevent rotation between said cap-piece and shield, substantially as described.

4. The combination with an expansible shield having spiral grooves arranged on the exterior thereof and capable of being exlpanded at the inner end thereof, of a member adapted to'engage unyieldingly and nonrotatably with the outer end of said shield to v101s vided on its bearing side with a T-shapedv undercut recess in the body thereof, said recess constituting with the said member an interlocking connection capable of being neck of reduced size near its outer end, and

device having an outturned flange on its dis-established prior to expansion by a relan `tive lateral movement, substantially as described'.

6. The combination with an expansible` shield having an outturned ange on its lock permanently therewith when said shield. is expanded, substantially as de,- scribed. n

7. The combination with an anchoring device having an outturned ange on its outer end, of a cap piece arranged when moved in a lateral-direction only to be en.- vgaged non-rotatably with said device, and means for thereafter preventing a return lateral movement of the said cap piece with respect to said device, whereby a permanent interlocking connection is established, substantially as described.

8. The combination with an anchoring device having a fiange arranged on its outer end, of a cap piece provided on its bearing side withv an undercut recess, said recess constituting with the said Bange an interlocking nonrotatable connection capable of' being dis-established prior to expansion by a relative lateral movement, substantially asl described.

9. The combination with an expansible shield having an outturned flange and a having its expansion produced through the actuation of a member entering the shield from its outer end, of a cap piece arranged when moved 'in a lateral direction only to be, guided into engagement with the flange and neck portion of said shield, and to be permanently interlocked therewith when saidactuating member is introduced into the shield, substantially as described.

l0. The combination with an expansible shield having lan outturned ange and a neck of reduced size near its outer end, and having its expansion produced through the actuation of a member entering the shield from its outer end, of'a cap piece arranged when moved vin a lateral direction only to be guided into a non-rotatable engagement with the said lange and neck portion of said shield, and to be permanently interlocked vtherewith when said actuating member is introduced into the shield, substantially as described.

11. The combination withfan expansible shield having one or more projecting members adjacent its outer end, of a cap piece arranged when moved in a lateral direction said shield and to be permanently locked therewith when said shield is expanded, said projecting members serving to prevent rotation of said cap piece with respect to said shield, substantially as described.

only to be guided into engagement with menace 12. The combination with an expansible shield having an outturned ange on its outer end, fand having its expansion produced through the actuation of a member entering the shield from the outer end thereof, of a cap piece formed with an undercut recess enlarged to provide an entering portion at one end, and adapted to receive the flanged end. of said shield therein when entered by a lateral movement in one direction through the said entering portion, and

to be permanently locked therein-when an actuating member is introduced into the shield for expanding the same, substantially -as described. Y

13. The combination with an expansible shield having an outturned flange on its outer end. and having its expansion produced through the actuation of a member entering the shield from the outer end thereof, of a cap piece formed with a laterally eX- tending undercut recess in the body thereof enlarged at one end to provide an entering portion, and adapted to. receive the anged end of said shield therein when entered by a lateral movement through said venlarged portion of the recess, and to be permanently locked therein when an actuatin'g member is introduced into the shield for expanding the Same, v and means fory preventing rotation of said cap piece with respect tosaid shield. f

14. The combination with an anchoring outer end, of a cap piece arranged when moved laterally in one directionl to engage with the flanged end of the device, said cap piece being capable of a limited swinging movement when so interlocked, substantially as described. I

15. The combination with. an expansible shield having an outturned Hange on its outer end, of a cap piece arranged when moved laterally in one direction to engage with the flanged end of the shield, and to lock permanently therewith when said shield is expanded, said cap piece being capable of a limited swinging movement when so interlocked, substantially as described.

16. The combination with an expansible shield having anV outturned ange on itsouter end, of a cap piece arranged when moved laterally in one direction to engageA l'piece arranged when lmovedlaterally in one engaging portions coperating tov prevent rotation ofthe shield with respect to the cap piece, said shield and cap piece being permanently interlocked when an actuating member is introduced into the shield, substantially as described.'v

18. The combination with an anchoring device having spiral grooves arranged on the exterior thereof, of a cap piece attchable to said device to form a non-rotatable connection therewith, whereby said cap piece serves as a medium for rotating said shield within a hole, said cap piece being attachable and detachable when moved only in a lateral direction, substantially as described.

19. The combination with an expansible shield having spiral grooves arranged on the exterior thereof, of a cap piece attachable to said expansible shield through a lateral movement to form a non-rotatable connection therewith, whereby said cap piece serves as a medium for rotating said shield within a hole, said cap piece being capable of a limited swinging movement with respect to said shield, and means for locking said cap piece against return lateral movement, said means serving also to cause said shield to expand within theu hole, substantially as described.

20. The combination with an expansible shield capable of being expanded at its inner end, of a member adapted when moved laterally in one direction to engage unyieldingly with the outer end of said shield'to prevent expanding action at such point said member being prevented from moving laterally in the opposite direction to unlock from said shield when expansion is commenced, substantially as described.

21. The combination with an expansible shield consisting of a plurality of shells releasably bound together, and capable of being expanded at its inner end, of a member adapted when movedlaterally in one direction to engage unyieldingly with the outer end of said shield to prevent expanding action at such point, said member being capable of a limited free swingingmovement with respect to the shield and about the axis thereof, substantially as described.

22. The combination with an anchoring device having an outturned flange on its outer end, of a cap piece arranged when moved laterally in one direction to engage with the flanged end of the device, and when moved laterally in the opposite direction to be disengaged from the device, substantially as described. e

23. As a new article of manufacture, a cap piece of symmetrical conguration having in the body thereof an undercut recess disposed adjacent one of its faces, the said recess terminating in an entering portion opening onto said face, substantially as described.. 4

24. :As anew article'vof manufacture, a cap' `piece having a bore extending therethrough and an undercut recess yin the body of the cap piece arranged to intersect said bore, substantially asdescribed.

25. As a new article of manufacture,= a cap piece having a bore extending therethrough, and an undercut recess in the body of the cap piece arranged to intersect said bore, the said recess terminating in an entering portion adjacent `one of the faces of the cap piece, substantially as described.

26. As a new article of manufacture, a cap piece having a portion of its exterior configured to provide a bearing surface, land an undercut' recess in the body of the cap piece adjacent said bearing surface, one end of said recess being enlarged to provide an entering portion facing on said bearing surface, substantially as described.

27. As a new article of manufacture, a cap piece having a portion of its exterior configured to provide a bearing surface, and anv undercut recess in the body of the cap piece adjacent said bearing surface, one end ofgsaid recess being enlarged to provide an entering portion facing on said bearing surface, said cap piece being provided with a bore extending into the body thereof and arranged to intersect said recess, substantially as described.

28. As a new article of manufacture, a cap piece provided with a bore extending therethrough, and -av recess extending laterally from said bore within the body of the cap piece, the said recess terminating adjacent one of the faces of the cap piece in an entering portion, the Walls whereof are rounded to facilitate passage therethrough, substantially as described.

29. As a new article of manufacture, a cap piece embodying a bearing face, the

walls adjacent said face being obliquely inclined at a substantially acute angle, an opening'into the body of the cap piece on the bearing face adjacent one of the inclined walls, the inner wall of said opening having an inclination correspondingvsomewhat to that of the said exterior wall, and an undercut recess communicating with said opening extendingl adjacent said bearing facewithin the body of the cap piece, substantially as described.

30. As a new article of manufacture, a cap piece embodying a bearing face, the walls adjacent said face being obliquely inclined at a substantially acute angle, an opening into the body of the 'cap piece on the bearing face adjacent onevof the inclined walls, the inner wall of said opening having an inclination corresponding somewhat to that of the said exterior wall, and an unundercut recessl disposed adjacent one of 10 its faces; the said recess terminating in an enlarged entering portion opening onto said face, substantially as described.

LOTHAR R. ZIFFERER.

Witnesses A. F. WEISGERBER, Jr., CEGELIA LIEQRNER. 

